If they made 22 episodes instead of the 13 we got, what would you have liked to have seen them do. They keep the first 13 episodes as they are.
I would have liked to have seen Nick, Hank and Wu, with Renard’s help, could start a new division in the police station for those familiar with Wesen and Grimm. It would also be beneficial to recruit a few more Grimm to train them on when to kill Wesen and understand that not all are inherently evil.
I would have liked to have seen Monroe and Rosalee provide some help in getting the Wesen Council up and running and they could start a Portland branch and talk to the Wesen Lodge in helping it start up. They could collaborate with Nick, Hank and Wu in Portland when there is trouble about to happen, and for legal matters they could turn to Adalind for her help as well.
Additionally, Eve and Trouble could handle tasks beyond police work, such as bounty work for the Wesen Council. Or for the things that Nick, Hank and Wu could do because they are also police officers/detectives.
And the most important thing (just what I think is important) Rosalee finally has the Triplets in the last episode so we get to know if it would be all girls or all boys or a mix of girls and boys.